MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Especificações descarregar pdf (Página 139)

Launching a Dialog to Confirm an Operation

5-15

•The No button callback executes uiresume after setting handles.answer to

'no'.

uiwait(fig);

if ~ishandle(fig)

answer = 'cancel';

else

handles = guidata(fig);

answer = handles.answer;

delete(fig);

end

Executing a Callback

This is the feval switchyard that enables modaldlg to execute the callback

subfunctions. It relies on the fact that when

modaldlg is called to execute a

callback, the first argument is a string (the name of the callback).

elseif ischar(varargin{1}) % Invoke named subfunction or callback

try

[varargout{1:nargout}] = feval(varargin{:}); % FEVAL switchyard

catch

disp(lasterr);

end

Defining the Yes and No Buttons Callbacks

The callbacks for the Yes and No buttons perform the same basic steps:

•Assign the user response in the

handles structure answer field.

•Use

guidata to save the modified handles structure, which is then read by

the main function.

•Use

uiresume to continue the blocked code in the main function.

The

Tag property of each push button uicontrol was changed before saving the

M-file so that the callback function names are more descriptive. The following

code illustrates the implementation of the callbacks.

function varargout = noButton_Callback(h, eventdata, handles, varargin)

handles.answer = 'no';

guidata(h, handles);

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Especificações Página 139